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The anterior thoracic nerve from the C5 to C8 roots innervates the pectoralis major and minor, and the thoracodorsal nerve from C6 to C8 roots innervates the latissimus dorsi muscle. The axillary nerve is formed by fibers of the C5 to C6 roots which go through the posterior cord of the plexus and innervate the deltoid and teres minor muscles, as well as part of the skin of the lateral shoulder.
The walls of the abdominal cavity are innervated by ventral rami of the last 6 thoracic nerves and the ilioinguinal and iliohypogastric nerves, with the expection of the diaphragm, the roof of the abdominal cavity, which is innervated by the phrenic nerve from the cervical plexus.ote: the common peroneal nerve and the tibial nerve together make up the sciatic nerve. Head and Neck. Muscles and structures of the head and neck are innervated by either cranial nerves off of the brainstem or by nerves that arise from the cervical plexus.